Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove Connector X20 from PCB
Measurement:
Check the resistance across connections 3 (black)& 16(blue) and then between 4 (grey)& 16 (blue)
Resistances approx. as follows;
Blue and Red resistance changes constantly.
Therefore no reading given.
Note: Ensure a good connection is made.
Resistances approx. as follows;
| Lead | |
| Blue & Black | |
| Blue & Grey | |
| Blue & Red |
Blue and Red resistance changes constantly.
Therefore no reading given.
Note: Ensure a good connection is made.
Isolate as per TOPs P4
and refit as necessary